Momentum Technologies LLC 
A guide to more than 3000 renewable energy businesses and organizations. Businesses by product type, business type, and location.
http://energy.sourceguides.com/CleanEnergy
Worldwide directory of renewable energy related companies, products, news, and events. Free companies registration. Many with web pages.
http://www.cleanenergy.de/
The Utility Connection
Links to 4,000 electric, gas, water and wastewater utilities, utility associations, organizations, news, magazines, utility financial resources, and related state and federal regulatory and information sites.
http://www.utilityconnection.com/
Power Technology
A portal for the electrical power industry: international product and service catalogue, event calendar, associations directory, and related links.
http://www.power-technology.com/
Allthingseco
Directory for environmentally friendly, sustainable, fair trade, organic, natural, ethical and socially responsible products, services and information.
http://www.allthingseco.co.uk/
